R API - Input-Output#

gurobi_read(filename, params=NULL)#

Reads a model from a file.

Parameters:

  • filename – Name of the file to read. Note that the type of the file is encoded in the file name suffix. The filename suffix should be one of .mps, .rew, .lp, .rlp, .dua, .dlp, .ilp, or .opb (see the file formats section for details on Gurobi file formats). The files can be compressed, so additional suffixes of .gz, .bz2, .zip, or .7z are accepted.

  • params – The params list, when provided, contains a list of modified Gurobi parameters. See the params argument section for more information.

Returns:

A model list variable, as described in the model section.

Example:
model <- gurobi_read('stein9.mps')
result <- gurobi(model)
gurobi_write(model, filename, params=NULL)#

Writes a model to a file.

Parameters:

  • model – The model list must contain a valid Gurobi model. See the model argument section for more information.

  • filename – Name of the file to write. Note that the type of the file is encoded in the file name suffix. The filename suffix should be one of .mps, .rew, .lp, .rlp, .dua, or .dlp to indicate the desired file format (see the file formats section for details on Gurobi file formats). The files can be compressed, so additional suffixes of .gz, .bz2, .zip, or .7z are accepted. Note that this function does not write the result of the IIS computation into an .ilp file format. See section gurobi_iis for more details.

  • params – The params list, when provided, contains a list of modified Gurobi parameters. See the params argument section for more information.

Example:
model            <- list()
model$A          <- matrix(c(1,2,3,1,1,0), nrow=2, byrow=T)
model$obj        <- c(1,1,2)
model$modelsense <- 'max'
model$rhs        <- c(4,1)
model$sense      <- c('<', '>')
gurobi_write(model, 'mymodel.mps');
gurobi_write(model, 'mymodel.lp');
gurobi_write(model, 'mymodel.mps.bz2');